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Two linear radio-opaque markers outline the polyethylene insert that normally sits on the tibial component of the unicompartment (medial) knee prosthesis.
In 2012 the markers are symmetrically positioned between the femoral and tibial components with an associated lucent gap - this is normal.
On the later examination the markers are antero-medial to the articulation with loss of the lucent articular gap indicating insert dislodgement.